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Erschienen in:
2014 | OriginalPaper | Buchkapitel
Quantitative Deformation Analysis of Landslides Based on Multi-period DEM Data
verfasst von : Qiang Xue, Maosheng Zhang, Lifeng Zhu, Xiujuan Cheng, Ying Pei, Junbo Bi
Erschienen in: Landslide Science for a Safer Geoenvironment
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Abstract
Quantitative deformation analysis of landslides is a difficult problem in landslide study. The quantitative deformation analysis model of landslide based on multi-period DEM data is established by ArcGIS using four periods of topographic maps obtained in 1977, 1997, 2001, and 2010, in order to reveal the processes of landslide evolution in the Heifangtai Irrigation Area. The deformation amount and deformation rate were calculated in stages for 32 landslides along the margins of Heifangtai platform in Yongjing, Gansu Province. The mean retrograde eroding velocity of landslide scarp was 4.47 m/a from 1977 to 1997, 3.46 m/a from 1997 to 2001, and 1.10 m/a from 2001 to 2010. At the same time, the relational formula between irrigation amount and landslide deformation amount was established, and the landslide evolution tendencies were predicted. The calculation results show that the average retrograde distance of the landslide scarps will be 0.79 m by 2015 and can be reduced to 0.20 m by 2020.